Removed #include of wingdi.h and windef.h from winuser.h (and resolved
the resulting compilation failures).

diff --git a/windows/nonclient.c b/windows/nonclient.c
index b3416c1..6394790 100644
--- a/windows/nonclient.c
+++ b/windows/nonclient.c
@@ -5,6 +5,8 @@
  *
  */
 
+#include "windef.h"
+#include "wingdi.h"
 #include "wine/winuser16.h"
 #include "version.h"
 #include "win.h"